The cat increase the kinetic energy of the cat-ring system is 42.4 J.
Mass of the merry-go-round = M = 7.6 kg
Outer radius of the merry-go-round = R2 = 0.9 m
Inner radius of the merry-go-round = R1 = R2/2 = 0.9/2 = 0.45 m
Moment of inertia of the merry-go-round = I
I = 3.8475 kg.m2
Mass of the cat = m = M/4 = 7.6/4 = 1.9 kg
Initially the cat is sitting at the outer edge that is at a distance of 'R2' from the center.
Initial moment of inertia of the system = I1
I1 = I + mR22
I1 = 3.8475 + (1.9)(0.9)2
I1 = 5.3865 kg.m2
Initial angular speed of the system = title=View image!
1 = 7.6 rad/s
Now the cat walks to the inner edge of the merry-go-round therefore it is at a distance 'R1' from the center.
New moment of inertia of the system = I2
I2 = I + mR12
I2 = 3.8475 + (1.9)(0.45)2
I2 = 4.23225 kg.m2
New angular speed of the system =
I = I2
(5.3865)(7.6) = (4.23225)2
= 9.673 rad/s
Initial kinetic energy of the system = E1
E2 = 198 J
Amount by which the kinetic energy of the system increases =
E = E2- E1
title=View image!
E = 198 - 155.6
ΔE = 42.4 J
Amount by which the kinetic energy of the system increases when the cat crawls to the inner edge = 42.4 J.
Kinetic Energy:
Kinetic energy is the energy that an object possesses due to its motion. It is defined as the work required to accelerate an object of specified mass from rest to a specified velocity. After the body acquires this energy during acceleration, it retains this kinetic energy as long as the velocity does not change.
Learn about Kinetic Energy here:
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